Background

Walking speed measurements are clinically important, but varying test procedures may influence measurements and impair clinical utility. This study assessed the concurrent validity of walking speed in individuals with chronic stroke measured during the 10-m walk test with variations in 1) the presence of an electronic mat, 2) the speed measurement device, and 3) the measurement distance relative to the total test distance.

Methods

Twenty-five individuals with chronic stroke performed walking tests at comfortable and maximal walking speeds under three conditions: 1) 10-m walk test (without electronic mat) measured by stopwatch, 2) 10-m walk test (partially over an electronic mat) measured by software, and 3) 10-m walk test (partially over an electronic mat) measured by stopwatch. Analyses of systematic bias, proportional bias, and absolute agreement were performed to determine concurrent validity between conditions.

Findings

Walking speeds were not different between measurements (P ≥ 0.11), except maximal walking speed was faster when speed was measured with software vs. stopwatch (P = 0.002). Absolute agreement between measurements was excellent (ICC ≥ 0.97, P < 0.001). There was proportional bias between software vs. stopwatch (R² ≥ 0.19, P ≤ 0.03) and between tests with vs. without the electronic mat (R² = 0.27, P = 0.008). Comparisons between conditions revealed that walking speed and concurrent validity may be influenced by walking test distance, presence of an electronic mat, speed measurement device, and relative measurement distance.

Interpretation

Walking test procedures influence walking speed and concurrent validity between measurements. Waking test procedures should be as similar as possible with normative data or between repeated measurements to optimize validity.

中文翻译：

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步行测试程序影响慢性中风患者的速度测量

背景

步行速度测量在临床上很重要，但不同的测试程序可能会影响测量并损害临床效用。本研究评估了在 10 米步行测试期间测量的慢性中风个体步行速度的同时有效性，其变化包括 1) 电子垫的存在，2) 速度测量设备，以及 3) 相对于测量距离的变化总测试距离。

方法

25 名慢性中风患者在以下三种条件下以舒适和最大步行速度进行步行测试：1) 10 米步行测试（无电子垫），由秒表测量，2）10 米步行测试（部分在电子垫上）由软件测量，和 3) 10 米步行测试（部分在电子垫上）由秒表测量。对系统偏倚、比例偏倚和绝对一致性进行分析以确定条件之间的并发有效性。

发现

测量之间的步行速度没有差异（P  ≥ 0.11），除了使用软件与秒表测量速度时的最大步行速度更快（P  = 0.002）。测量值之间的绝对一致性非常好（ICC ≥ 0.97，P  < 0.001）。软件与秒表 (R ²  ≥ 0.19, P  ≤ 0.03) 之间以及使用与不使用电子垫的测试之间存在比例偏差(R ²  = 0.27, P  = 0.008)。条件之间的比较显示步行速度和并发有效性可能受步行测试距离、电子垫的存在、速度测量设备和相对测量距离的影响。

解释

步行测试程序会影响步行速度和测量之间的并发有效性。唤醒测试程序应与规范数据或重复测量之间尽可能相似，以优化有效性。